Abstract
SrTiO3/epoxy nanocomposites are prepared using the facile solution-processing technique by incorporating SrTiO3 nanoparticles with different weight fractions into the epoxy resin host. The morphology of the nanoparticles and composites, as well as the thermal conduction characteristics and electrical properties of the composites were investigated via conventional testing methods. The thermal conductivity increased along with the SrTiO3 weight fractions, and the thermal conductivity of the SrTiO3/epoxy composite with 40 wt % weight fraction increased to 0.52 W/mK. The dielectric constant increased along with the weight fractions and decreased along with frequency, thereby suggesting that the interfacial and dipole polarization do not follow the changes in the electrical field direction at high frequency. The dielectric constants at 1 kHz frequency increased along with temperature. Surface breakdown tests illustrated further improvements in the thermal and electrical properties of the composites. In the same time span of 40 s, the 40 wt % nanocomposite demonstrated a rapid temperature decline rate of 6.77 °C/s, which was 47% faster than that of the pure epoxy sample. The surface breakdown voltage also increased along with the weight fractions. The functional composites can solve the key problem in the intelligentization, miniaturization, and high-efficiency of the gas-insulated switchgear, which warrants further research.
Highlights
Epoxy resin is known for its excellent electrical properties, including high dielectric breakdown strength and electrothermal stability, which account for its wide practical application in the manufacturing of electrical equipment
SrTiO3 /epoxy composites with SrTiO3 loading amounts ranging from 7 wt % to 40 wt % were fabricated as follows: First, the modified particles were mixed into the low-viscosity epoxy resin, dubbed as E51, and stirred at 60 ◦ C for 1 h
A thin layer of film covered the surface of the rough particles to reflect the 3 shows a transmission electron microscopy (TEM) image of the modified SrTiO3 interactioninteraction between the silane the coupling agent
Summary
Epoxy resin is known for its excellent electrical properties, including high dielectric breakdown strength and electrothermal stability, which account for its wide practical application in the manufacturing of electrical equipment. The accumulation of heat at the contact layer between the metal parts and the insulating polymer matrix can increase and flourish rapidly, especially when partial defects are encountered during the assembly process. The incorporation of nanoparticles into the polymer matrix has received extensive attention because of its potential to increase thermal conductivity while sustaining a high dielectric breakdown strength [4,5]. The reduction of dielectric strength has received limited attention in previous articles, most of which demonstrate the possible improvements in thermal conductivity after the incorporation of nanoparticles [12,13,14,15,16,17]. The effects of SrTiO3 nanoparticle content on morphology, thermal properties, and dielectric properties were discussed from the perspective of the structure–property relationship to guide future studies on the flashover characteristics and heat dissipation of the designed nanocomposites under different protective atmospheres
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